python - 按下按钮时的PyAudio记录

Question

我对python或pyaudio的经验不是很丰富，我正试图用USB麦克风录制声音，只要按下与GPIO相连的按钮即可。我找到了可能的解决方案here，但是发布的代码对我不起作用，它无法识别释放的按钮：

#!/usr/bin/python
import RPi.GPIO as GPIO

import pyaudio
import wave
import time

FORMAT = pyaudio.paInt16
CHANNELS = 1
RATE = 44100
CHUNK = 512
RECORD_SECONDS = 5
WAVE_OUTPUT_FILENAME = "rec41000.wav"

p = pyaudio.PyAudio()

#audio_info = p.get_device_info_by_index(0)
#print (audio_info)

#GPIO pin setup for button
ledPin = 18
buttonPin = 23

#set up GPIO using BCM numbering
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)

#enable LED and button (button with pull-up)
GPIO.setup(ledPin, GPIO.OUT)
GPIO.setup(buttonPin, GPIO.IN, pull_up_down=GPIO.PUD_UP)

#set LED to OFF
GPIO.output(ledPin, GPIO.LOW)

while(True):

    print "waiting for button event"

    #wait for button to be pressed
    time.sleep(0.2)
    GPIO.wait_for_edge(buttonPin, GPIO.FALLING)

    while True:
        try:
                    frames = []
                    stream = p.open(format = FORMAT,
                                            channels = CHANNELS, 
                                            rate = RATE, 
                                            input = True,
                                            frames_per_buffer = CHUNK)

                    print "* recording"
                    #turn on LED ring when recording starts
                    GPIO.output(ledPin, GPIO.HIGH)

                    #record as long as button held down
                    while GPIO.input(buttonPin) == 0:
                        data = stream.read(CHUNK)
                        frames.append(data)

                        break

                except IOError:
                        printer.println(textWrapped('- Aufnahmefehler. Starte neu, Moment bitte. -', 32))

    # button released
    print "* done"
    GPIO.output(ledPin, GPIO.LOW)

    stream.stop_stream()
    stream.close()
    p.terminate()

    #make wave file from recorded data stream
    wf = wave.open(WAVE_OUTPUT_FILENAME, 'wb')
    wf.setnchannels(CHANNELS)
    wf.setsampwidth(p.get_sample_size(FORMAT))
    wf.setframerate(RATE)
    wf.writeframes(b''.join(frames))
    wf.close()   

我该怎么办？我使用的是this教程的代码，录音测试工作正常。

Answer 1

不清楚这是否是在粘贴到堆栈溢出时引起的格式化错误，但是break语句不合适吗？

在我看来，应该将其用于打破外部循环，否则您将无法退出外部循环。

对于您的用例，实际上看起来您根本不需要该外部循环。